Changing the code to run faster - direct port manipulation HELP!

hello,
i need program faster communication between encoder , arduino mini pulse , direction pin.
i enclose old program works @ higher speed encoderja losing signal faster movement of stepper motor.

code: [select]

void setup () {
  //set various outputs
  pinmode(motor_step, output);
  pinmode(motor_direction, output);
 
  // encoder inputs
  pinmode(encoder_a, input);
  pinmode(encoder_b, input);
  // enable pullup using open collector encoder
  digitalwrite(encoder_a, high);
  digitalwrite(encoder_b, high);
 
  // encoder pin on interrupt 0 (pin 2)
  attachinterrupt(0, encoderpinchangea, change);
  // encoder pin on interrupt 1 (pin 3)
  attachinterrupt(1, encoderpinchangeb, change);
  encoder = 0; //reseet encoder position 0
}

void loop() {
  //do stuff dependent on encoder position here
  //such move stepper motor match encoder position
  //if want make 1:1 ensure encoder res matches motor res dividing/multiplying
  if (encoder > 0) {
    digitalwrite(motor_direction, high);// move stepper in reverse
    digitalwrite(motor_step, high);
    digitalwrite(motor_step, low);
    delaymicroseconds(600); //_delay_us(200); //modify alter speed
    motor_position++;
    encoder = 0; //encoder--;
  }
  else if (encoder < 0) {
    digitalwrite (motor_direction, low); //move stepper forward
    digitalwrite (motor_step, high);
    digitalwrite (motor_step, low);
    delaymicroseconds(600); //_delay_us(200); //modify alter speed
    motor_position--;
    encoder = 0; //encoder++;
  }
}

replaced direct manipulation port.  program has no errors not work.

code: [select]

void setup () {
  //set various outputs
  pinmode(motor_step, output);
  pinmode(motor_direction, output);

  // encoder inputs
  pinmode(encoder_a, input);
  pinmode(encoder_b, input);

  // enable pullup using open collector encoder
  digitalwrite(encoder_a, high);
  digitalwrite(encoder_b, high);

  // encoder pin on interrupt 0 (pin 2)
  attachinterrupt(0, encoderpinchangea, change);
  // encoder pin on interrupt 1 (pin 3)
  attachinterrupt(1, encoderpinchangeb, change);
  encoder = 0; //reseet encoder position 0
}

void loop() {
  //do stuff dependent on encoder position here
  //such move stepper motor match encoder position
  //if want make 1:1 ensure encoder res matches motor res dividing/multiplying
  if (encoder > 0) {

    //digitalwrite(motor_direction, high);// move stepper in reverse
    portd = portd | 0b00100000;
    //digitalwrite(motor_step, high);
    portd = portd | 0b00010000;
    //digitalwrite(motor_step, low);
    portd = portd & 0b11101111;
    delaymicroseconds(600); //_delay_us(200); //modify alter speed
    motor_position++;
    encoder = 0; //encoder--;
  }
  else if (encoder < 0) {
    //digitalwrite (motor_direction, low); //move stepper forward
    portd = portd & 0b11011111;
    //digitalwrite (motor_step, high);
    portd = portd | 0b00010000;
    //digitalwrite (motor_step, low);
    portd = portd & 0b11101111;
    delaymicroseconds(600); //_delay_us(200); //modify alter speed
    motor_position--;
    encoder = 0; //encoder++;
  }
}


all of declarations , isr routines missing code won't compile.

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